Advisory ID: cisco-sa-20010131-arrowpoint-cli-fs
For Public Release 2001 January 31 16:00 UTC (GMT)
The Cisco Content Services (CSS) switch product, also known as
Arrowpoint, has two security vulnerabilities once access to the command line
interface (CLI) is granted. The first vulnerability, the switch can be forced
into a temporary denial of service by an unprivileged user, this is documented
in Cisco Bug ID CSCdt08730. The second issue allows a non-privileged user to
view filenames and file contents. This is documented in Cisco Bug ID
The full text of this advisory can be viewed at:
This section provides details on affected products.
The Cisco Content Services Switch is affected by this group of
vulnerabilities. The CSS switch is also known as Arrowpoint product, and runs
the Cisco WebNS Software.
Cisco CSS 11050, CSS 11150, and CSS 11800 hardware platforms are
affected by this group of vulnerabilities.
No other Cisco products are affected by this group of vulnerabilities.
No other Cisco products are currently known to be affected by these
The Cisco CSS11000 must be configured to permit command line access to
users by providing a management address and defining user accounts. Once
command line access is gained by non privileged users (defined user accounts
without administrative privileges), running a command requiring a filename, and
providing a filename that is the maximum length of the input buffer can cause
the switch to reboot, and a system check to be started which will prevent
normal function of the switch for up to 5 minutes. The show
script, clear script,
show archive, clear
archive, show log, and
clear log commands are capable of causing the CSS to
restart if the specified file name is the maximum length of the input buffer.
Cisco Bug ID CSCdt08730.
If command line access is not restricted, a non privileged user
(defined user account without administrative privileges) can gain information
on the directory structure by requesting non-existent filenames. Additionally,
the non privileged user can gain read access for files if the directory
structure of the target files are known to the user. Cisco Bug ID CSCdt12748
describes this file system vulnerability.
Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.
Cisco has provided an FAQ to answer additional questions regarding CVSS at
Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at
The vulnerability described in CSCdt08730 can be continuously
reproduced to produce a Denial of Service attack. The additional
vulnerabilities provide unauthorized access to important files such as the
configuration files, and directory structure information. If access to the
command line interface is well protected and restricted, then these
vulnerabilities are minimized.
CSCdt08730 is resolved in revision 4.01(12s), and revision 3.10 (71s)
of Cisco WebNS software. The file system information disclosure vulnerabilities
are resolved in revision 4.01(23s) and revision 4.10(13s).
Access control lists can be applied to restrict access to the Cisco CSS
device, as well as additional firewall or access lists to restrict connection
to the management interface. Access control lists also affect traffic to the
Virtual interface of the Cisco CSS device, so must be applied with care. For
further details on configuring access lists please refer to the product
Additionally, the use of SSH to prevent snooping of the management
traffic to the device is encouraged.
Telnet service can also be disabled, for many customers in a
co-location environment this is not a feasible option, but is included in this
section for customers that may have the ability to implement this
CS150(config)# telnet access disabled
Additionally, it is recommended to select strong passwords in
accordance with your own security policies, and to adhere to your own security
policies on changing passwords frequently, or when staffing changes
Cisco has made free software available to address this vulnerability
for affected customers. Prior to deploying software, customers should consult
their maintenance provider or check the software for feature set compatibility
and known issues specific to their environment.
Customers may only install and expect support for the feature sets they
have purchased. By installing, downloading, accessing or otherwise using such
software upgrades, customers agree to be bound by the terms of Cisco's software
license terms found at
or as otherwise set forth at Cisco.com Downloads at
Do not contact either "email@example.com" or "firstname.lastname@example.org"
for software upgrades.
Customers with contracts should obtain upgraded software through their
regular update channels. For most customers, this means that upgrades should be
obtained through the Software Center on Cisco's worldwide website at
Customers whose Cisco products are provided or maintained through prior
or existing agreement with third-party support organizations such as Cisco
Partners, authorized resellers, or service providers should contact that
support organization for guidance and assistance with the appropriate course of
action in regards to this advisory.
The effectiveness of any workaround or fix is dependent on specific
customer situations such as product mix, network topology, traffic behavior,
and organizational mission. Due to the variety of affected products and
releases, customers should consult with their service provider or support
organization to ensure any applied workaround or fix is the most appropriate
for use in the intended network before it is deployed.
Customers who purchase direct from Cisco but who do not hold a Cisco
service contract and customers who purchase through third-party vendors but are
unsuccessful at obtaining fixed software through their point of sale should get
their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC
contacts are as follows.
+1 800 553 2447 (toll free from within North America)
+1 408 526 7209 (toll call from anywhere in the world)
Have your product serial number available and give the URL of this
notice as evidence of your entitlement to a free upgrade. Free upgrades for
non-contract customers must be requested through the TAC.
for additional TAC contact information, including special localized telephone
numbers and instructions and e-mail addresses for use in various
The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerabilities described in this advisory. These vulnerabilities
were discovered by a Security Consulting firm during a customer security
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A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.
This advisory will be posted on Cisco's worldwide website at
In addition to worldwide web posting, a text version of this notice is
clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail
and Usenet news recipients.
email@example.com (includes CERT/CC)
Various internal Cisco mailing lists
Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on mailing lists or
newsgroups. Users concerned about this problem are encouraged to check the
above URL for any updates.
The Software Versions and Fixes section was changed from :
"CSCdt08730 is resolved in revision 4.01(12s), and revision 3.10 (71s) of Cisco
WebNS software. The file system information disclosure vulnerabilities are
scheduled to be fixed, but are currently unresolved. Workarounds are
recommended in the interim. This notice will be updated when the
vulnerabilities are resolved, or monthly until the vulnerabilities are
"CSCdt08730 is resolved in revision 4.01(12s), and revision
3.10 (71s) of Cisco WebNS software. The file system information disclosure
vulnerabilities are resolved in revision 4.01(23s) and revision 4.10(13s)."
The status of this notice was changed from INTERIM to FINAL,
and the wording under the Status of This Notice section was changed from: "This
is an interim notice. Although Cisco cannot guarantee the accuracy of all
statements in this notice, all of the facts have been checked to the best of
our ability. Cisco anticipates issuing updated versions of this notice as the
software is updated. Cisco will update this notice by 2001-MAR-01."
"This is an final notice. Although Cisco cannot guarantee the
accuracy of all statements in this notice, all of the facts have been checked
to the best of our ability. Cisco does not anticipate issuing updated versions
of this notice unless there is some material change in the facts. Should there
be a significant change in the facts, Cisco may update this notice."
The following sentence was changed: "The Cisco Content Services
(CSS) switch product, also known as Arrowpoint, has several security
vulnerabilities once access to the command line interface (CLI) is
"The Cisco Content Services (CSS) switch product, also known
as Arrowpoint, has two security vulnerabilities once access to the command line
interface (CLI) is granted."
The word "several" was changed to "two"
Initial public release.